aboutsummaryrefslogtreecommitdiff
path: root/src/include/gnunet_reclaim_plugin.h
blob: 11d5d76f7586f926a9370c8ee8176536790c8fd0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
/*
     This file is part of GNUnet
     Copyright (C) 2012, 2013 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Affero General Public License for more details.

     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */

/**
 * @author Martin Schanzenbach
 *
 * @file
 * Plugin API for reclaim attribute types
 *
 * @defgroup reclaim-attribute-plugin  reclaim plugin API for attributes/claims
 * @{
 */
#ifndef GNUNET_RECLAIM_PLUGIN_H
#define GNUNET_RECLAIM_PLUGIN_H

#include "gnunet_util_lib.h"
#include "gnunet_reclaim_lib.h"

#ifdef __cplusplus
extern "C" {
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif


/**
 * Function called to convert the binary value @a data of an attribute of
 * type @a type to a human-readable string.
 *
 * @param cls closure
 * @param type type of the attribute
 * @param data value in binary encoding
 * @param data_size number of bytes in @a data
 * @return NULL on error, otherwise human-readable representation of the value
 */
typedef char *(*GNUNET_RECLAIM_AttributeValueToStringFunction) (
  void *cls,
  uint32_t type,
  const void *data,
  size_t data_size);


/**
 * Function called to convert human-readable version of the value @a s
 * of an attribute of type @a type to the respective binary
 * representation.
 *
 * @param cls closure
 * @param type type of the attribute
 * @param s human-readable string
 * @param data set to value in binary encoding (will be allocated)
 * @param data_size set to number of bytes in @a data
 * @return #GNUNET_OK on success
 */
typedef int (*GNUNET_RECLAIM_AttributeStringToValueFunction) (
  void *cls,
  uint32_t type,
  const char *s,
  void **data,
  size_t *data_size);


/**
 * Function called to convert a type name to the
 * corresponding number.
 *
 * @param cls closure
 * @param typename name to convert
 * @return corresponding number, UINT32_MAX on error
 */
typedef uint32_t (*GNUNET_RECLAIM_AttributeTypenameToNumberFunction) (
  void *cls,
  const char *typename);


/**
 * Function called to convert a type number to the
 * corresponding type string (e.g. 1 to "A")
 *
 * @param cls closure
 * @param type number of a type to convert
 * @return corresponding typestring, NULL on error
 */
typedef const char *(*GNUNET_RECLAIM_AttributeNumberToTypenameFunction) (
  void *cls,
  uint32_t type);

/**
 * Function called to convert the binary value @a data of an attribute of
 * type @a type to a human-readable string.
 *
 * @param cls closure
 * @param type type of the attribute
 * @param data value in binary encoding
 * @param data_size number of bytes in @a data
 * @return NULL on error, otherwise human-readable representation of the value
 */
typedef char *(*GNUNET_RECLAIM_CredentialValueToStringFunction) (
  void *cls,
  uint32_t type,
  const void *data,
  size_t data_size);


/**
 * Function called to convert human-readable version of the value @a s
 * of an attribute of type @a type to the respective binary
 * representation.
 *
 * @param cls closure
 * @param type type of the attribute
 * @param s human-readable string
 * @param data set to value in binary encoding (will be allocated)
 * @param data_size set to number of bytes in @a data
 * @return #GNUNET_OK on success
 */
typedef int (*GNUNET_RECLAIM_CredentialStringToValueFunction) (
  void *cls,
  uint32_t type,
  const char *s,
  void **data,
  size_t *data_size);


/**
 * Function called to convert a type name to the
 * corresponding number.
 *
 * @param cls closure
 * @param typename name to convert
 * @return corresponding number, UINT32_MAX on error
 */
typedef uint32_t (*GNUNET_RECLAIM_CredentialTypenameToNumberFunction) (
  void *cls,
  const char *typename);


/**
 * Function called to convert a type number to the
 * corresponding type string (e.g. 1 to "A")
 *
 * @param cls closure
 * @param type number of a type to convert
 * @return corresponding typestring, NULL on error
 */
typedef const char *(*GNUNET_RECLAIM_CredentialNumberToTypenameFunction) (
  void *cls,
  uint32_t type);

/**
 * Function called to extract attributes from a credential
 *
 * @param cls closure
 * @param cred the credential object
 * @return an attribute list
 */
typedef struct
  GNUNET_RECLAIM_AttributeList *(*
GNUNET_RECLAIM_CredentialGetAttributesFunction) (
  void *cls,
  const struct GNUNET_RECLAIM_Credential *cred);

/**
 * Function called to get the issuer of the credential (as string)
 *
 * @param cls closure
 * @param cred the credential object
 * @return corresponding issuer string
 */
typedef char *(*GNUNET_RECLAIM_CredentialGetIssuerFunction) (
  void *cls,
  const struct GNUNET_RECLAIM_Credential *cred);

/**
 * Function called to get the expiration of the credential
 *
 * @param cls closure
 * @param cred the credential object
 * @param where to write the value
 * @return GNUNET_OK if successful
 */
typedef int (*GNUNET_RECLAIM_CredentialGetExpirationFunction) (
  void *cls,
  const struct GNUNET_RECLAIM_Credential *cred,
  struct GNUNET_TIME_Absolute *expiration);

/**
 * Function called to convert the binary value @a data of an attribute of
 * type @a type to a human-readable string.
 *
 * @param cls closure
 * @param type type of the attribute
 * @param data value in binary encoding
 * @param data_size number of bytes in @a data
 * @return NULL on error, otherwise human-readable representation of the value
 */
typedef char *(*GNUNET_RECLAIM_PresentationValueToStringFunction) (
  void *cls,
  uint32_t type,
  const void *data,
  size_t data_size);


/**
 * Function called to convert human-readable version of the value @a s
 * of an attribute of type @a type to the respective binary
 * representation.
 *
 * @param cls closure
 * @param type type of the attribute
 * @param s human-readable string
 * @param data set to value in binary encoding (will be allocated)
 * @param data_size set to number of bytes in @a data
 * @return #GNUNET_OK on success
 */
typedef int (*GNUNET_RECLAIM_PresentationStringToValueFunction) (
  void *cls,
  uint32_t type,
  const char *s,
  void **data,
  size_t *data_size);


/**
 * Function called to convert a type name to the
 * corresponding number.
 *
 * @param cls closure
 * @param typename name to convert
 * @return corresponding number, UINT32_MAX on error
 */
typedef uint32_t (*GNUNET_RECLAIM_PresentationTypenameToNumberFunction) (
  void *cls,
  const char *typename);


/**
 * Function called to convert a type number to the
 * corresponding type string (e.g. 1 to "A")
 *
 * @param cls closure
 * @param type number of a type to convert
 * @return corresponding typestring, NULL on error
 */
typedef const char *(*GNUNET_RECLAIM_PresentationNumberToTypenameFunction) (
  void *cls,
  uint32_t type);

/**
 * Function called to extract attributes from a credential
 *
 * @param cls closure
 * @param cred the credential object
 * @return an attribute list
 */
typedef struct
  GNUNET_RECLAIM_AttributeList *(*
GNUNET_RECLAIM_PresentationGetAttributesFunction) (
  void *cls,
  const struct GNUNET_RECLAIM_Presentation *cred);

/**
 * Function called to get the issuer of the credential (as string)
 *
 * @param cls closure
 * @param cred the credential object
 * @return corresponding issuer string
 */
typedef char *(*GNUNET_RECLAIM_PresentationGetIssuerFunction) (
  void *cls,
  const struct GNUNET_RECLAIM_Presentation *cred);

/**
 * Function called to get the expiration of the credential
 *
 * @param cls closure
 * @param cred the credential object
 * @param where to write the value
 * @return GNUNET_OK if successful
 */
typedef int (*GNUNET_RECLAIM_PresentationGetExpirationFunction) (
  void *cls,
  const struct GNUNET_RECLAIM_Presentation *cred,
  struct GNUNET_TIME_Absolute *expiration);

typedef int (*GNUNET_RECLAIM_CredentialToPresentation) (
  void *cls,
  const struct GNUNET_RECLAIM_Credential *cred,
  const struct GNUNET_RECLAIM_AttributeList *attrs,
  struct GNUNET_RECLAIM_Presentation **presentation);

/**
 * Each plugin is required to return a pointer to a struct of this
 * type as the return value from its entry point.
 */
struct GNUNET_RECLAIM_AttributePluginFunctions
{
  /**
   * Closure for all of the callbacks.
   */
  void *cls;

  /**
   * Conversion to string.
   */
  GNUNET_RECLAIM_AttributeValueToStringFunction value_to_string;

  /**
   * Conversion to binary.
   */
  GNUNET_RECLAIM_AttributeStringToValueFunction string_to_value;

  /**
   * Typename to number.
   */
  GNUNET_RECLAIM_AttributeTypenameToNumberFunction typename_to_number;

  /**
   * Number to typename.
   */
  GNUNET_RECLAIM_AttributeNumberToTypenameFunction number_to_typename;

};

/**
 * Each plugin is required to return a pointer to a struct of this
 * type as the return value from its entry point.
 */
struct GNUNET_RECLAIM_CredentialPluginFunctions
{
  /**
   * Closure for all of the callbacks.
   */
  void *cls;

  /**
   * Conversion to string.
   */
  GNUNET_RECLAIM_CredentialValueToStringFunction value_to_string;

  /**
   * Conversion to binary.
   */
  GNUNET_RECLAIM_CredentialStringToValueFunction string_to_value;

  /**
   * Typename to number.
   */
  GNUNET_RECLAIM_CredentialTypenameToNumberFunction typename_to_number;

  /**
   * Number to typename.
   */
  GNUNET_RECLAIM_CredentialNumberToTypenameFunction number_to_typename;

  /**
   * Attesation attributes.
   */
  GNUNET_RECLAIM_CredentialGetAttributesFunction get_attributes;

  /**
   * Attesation issuer.
   */
  GNUNET_RECLAIM_CredentialGetIssuerFunction get_issuer;

  /**
   * Expiration.
   */
  GNUNET_RECLAIM_CredentialGetExpirationFunction get_expiration;

  /**
   * Conversion to string.
   */
  GNUNET_RECLAIM_PresentationValueToStringFunction value_to_string_p;

  /**
   * Conversion to binary.
   */
  GNUNET_RECLAIM_PresentationStringToValueFunction string_to_value_p;

  /**
   * Typename to number.
   */
  GNUNET_RECLAIM_PresentationTypenameToNumberFunction typename_to_number_p;

  /**
   * Number to typename.
   */
  GNUNET_RECLAIM_PresentationNumberToTypenameFunction number_to_typename_p;

  /**
   * Attesation attributes.
   */
  GNUNET_RECLAIM_PresentationGetAttributesFunction get_attributes_p;

  /**
   * Attesation issuer.
   */
  GNUNET_RECLAIM_PresentationGetIssuerFunction get_issuer_p;

  /**
   * Expiration.
   */
  GNUNET_RECLAIM_PresentationGetExpirationFunction get_expiration_p;

  /**
   * Get presentation
   */
  GNUNET_RECLAIM_CredentialToPresentation create_presentation;

};


#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif

#endif

/** @} */ /* end of group */